Preheat oven to 350* F. Prepare an 8x4 loaf pan with pan spray or rub with coconut oil and dust with flour.
First, mix the cinnamon swirl. In a small bowl, combine the agave, cinnamon, salt and flour. Stir well to combine. Set aside.
In a small bowl, combine flour, baking powder, baking soda, salt and cinnamon. Set aside.
In a large bowl, combine mashed banana, oil, sugar, plant milk, and vanilla. Stir to combine.
Add the dry ingredients into the wet ingredients, folding with a spatula until everything is just combined.
Add about ⅓ of the banana bread batter to the prepared pan. Gently spread so it covers the bottom of the pan. Drizzle about 2 tablespoons of the cinnamon swirl mixture on top of the batter.
Layer like this, twice more until batter is gone, making sure to top the loaf with a drizzle of cinnamon mixture.
Bake in a 350* oven for 60-63 minutes, or until a toothpick inserted into the center of the loaf comes out with just a few moist crumbs attached.
Let cool completely before slicing (if you can haha). Enjoy!